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/*
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 2022 Gothel Software e.K.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* [Operating Systems](https://sourceforge.net/p/predef/wiki/OperatingSystems/)
* predefined macros.
* - BSD included from <sys/param.h>
*/
#include <sys/param.h>
/**
* [Unix standards](https://sourceforge.net/p/predef/wiki/Standards/)
* require the existence macros in the <unistd.h> header file.
*/
#include <unistd.h>
/**
* [GNU glibc](https://sourceforge.net/p/predef/wiki/Libraries/)
*
* GLIBC macros have to be included from the <features.h> header file.
* Include <limits.h> header file instead, which included <features.h> on GLIBC (see e.g. paragraph 4/6 in ISO/IEC 9899:1999).
*/
#include <climits>
/**
* [glibc 1.3.4 Feature Test Macros](https://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html)
* _FILE_OFFSET_BITS
* - available if _POSIX_C_SOURCE >= 200112L
* - _FILE_OFFSET_BITS == 64 implies using all 64-bit file-function and -type variants on 32-bit platforms
* - _FILE_OFFSET_BITS == 64 has no effect on 64-bit platforms, already using the 64-bit variants
* - _FILE_OFFSET_BITS is favored over _LARGEFILE64_SOURCE
*
* _TIME_BITS
* - introduced in glibc 2.34, tackling year 2038 issue
* - _TIME_BITS available for Linux with kernel >= 5.1
* - _TIME_BITS == 64 requires _FILE_OFFSET_BITS to be 64 as well
*
* glibc D.2.1 64-bit time symbol handling in the GNU C Library
* __TIMESIZE == 64 uses 64-bit time_t version
*/
extern "C" {
// don't include anything yes as we like to grab the vanilla values first
extern int printf(const char * format, ...);
}
int my_strcmp(const char *, const char *);
#define MACRO_STRINGIFY(item) "" #item
#define COND_CODE(macro, code) \
do { \
if (my_strcmp("" #macro, MACRO_STRINGIFY(macro))) { \
(code); \
} \
} while (0)
#define PRINT_COND(macro) \
do { \
if (my_strcmp("" #macro, MACRO_STRINGIFY(macro))) { \
printf("- %s\t%s\n", #macro, MACRO_STRINGIFY(macro)); \
} else { \
printf("- %s\t-\n", #macro); \
} \
} while (0)
void print_unix_std() {
printf("Operating System\n");
PRINT_COND(BSD);
PRINT_COND(__FreeBSD__);
PRINT_COND(__NetBSD__);
PRINT_COND(__OpenBSD__);
PRINT_COND(__bsdi__);
PRINT_COND(__DragonFly__);
PRINT_COND(_SYSTYPE_BSD);
PRINT_COND(__CYGWIN__);
PRINT_COND(__GNU__);
PRINT_COND(__gnu_hurd__);
PRINT_COND(__gnu_linux__);
PRINT_COND(__linux__);
PRINT_COND(__APPLE__);
PRINT_COND(__QNX__);
PRINT_COND(__QNXNTO__);
PRINT_COND(sun);
PRINT_COND(__sun);
PRINT_COND(__CYGWIN__);
PRINT_COND(_WIN32); // for 32- and 64-bit environments
PRINT_COND(_WIN64); // for 64-bit environments only
printf("\n");
printf("Unix Standards Inputs\n");
PRINT_COND(_POSIX_C_SOURCE);
PRINT_COND(_FILE_OFFSET_BITS);
PRINT_COND(_LARGEFILE64_SOURCE);
PRINT_COND(_TIME_BITS);
PRINT_COND(__TIMESIZE);
printf("\n");
printf("Unix Standards Outputs\n");
PRINT_COND(_POSIX_VERSION);
PRINT_COND(_POSIX2_C_VERSION);
PRINT_COND(_XOPEN_VERSION);
PRINT_COND(__LSB_VERSION__);
printf("\n");
}
void print_libc() {
printf("GLIBC C Library Outputs\n");
PRINT_COND(__GNU_LIBRARY__);
PRINT_COND(__GLIBC__);
PRINT_COND(__GLIBC_MINOR__);
printf("\n");
printf("Bionic C Library Outputs\n");
PRINT_COND(__BIONIC__);
printf("\n");
printf("uClibc C Library Outputs\n");
PRINT_COND(__UCLIBC__);
printf("\n");
printf("GNU C++ Library Outputs\n");
PRINT_COND(__GLIBCPP__);
PRINT_COND(__GLIBCXX__);
printf("\n");
printf("C++ Library Outputs\n");
PRINT_COND(_LIBCPP_VERSION);
PRINT_COND(_LIBCPP_ABI_VERSION);
printf("\n");
printf("\n");
}
#include <jau/test/catch2_ext.hpp>
#include <jau/basic_types.hpp>
#include <cstring>
int my_strcmp(const char *s1, const char *s2) {
return ::strcmp(s1, s2);
}
/**
* Resembling the GNU/Linux bits/types.h,
* documenting whether time_t is 32-bit (arm-32) or 64-bit (arm-64, x86_64, ..).
*/
static int sizeof_time_t() {
/* X32 kernel interface is 64-bit. */
#if defined __x86_64__ && defined __ILP32__
// 64 bit size
#if __WORDSIZE == 32
return sizeof( __int64_t );
#else
return sizeof( long int );
#endif
#else
// 32 bit or 64 bit
return sizeof( long int );
#endif
}
/**
* Resembling the GNU/Linux bits/types.h,
* documenting whether tv_nsec of struct timespec is 32-bit (arm-32) or 64-bit (arm-64, x86_64, ..).
*/
static int sizeof_tv_nsec() {
#if __WORDSIZE == 64 \
|| (defined __SYSCALL_WORDSIZE && __SYSCALL_WORDSIZE == 64) \
|| __TIMESIZE == 32
// 32 bit or 64 bit: __syscall_slong_t
return sizeof( int64_t );
#else
// 32 bit or 64 bit
return sizeof( long int );
#endif
}
TEST_CASE( "Unix StandardsTest 01.00", "[unix][posix]" ) {
print_unix_std();
{
using time_t_type = decltype(timespec::tv_sec);
INFO_STR(" tv_sec: sizeof=" + std::to_string( sizeof( time_t_type ) ) + ", signed " + std::to_string( std::is_signed_v<time_t_type>) );
CHECK( sizeof_time_t() == sizeof( time_t_type ) );
CHECK( true == std::is_signed_v<time_t_type> );
using ns_type = decltype(timespec::tv_nsec);
INFO_STR(" tv_nsec: sizeof=" + std::to_string( sizeof( ns_type ) ) + ", signed " + std::to_string( std::is_signed_v<ns_type>) );
CHECK( sizeof_tv_nsec() == sizeof( ns_type ) );
CHECK( true == std::is_signed_v<ns_type> );
}
{
INFO_STR(" off_t sizeof=" + std::to_string( sizeof( off_t ) ) + ", signed " + std::to_string( std::is_signed_v<off_t>) );
INFO_STR(" off64_t sizeof=" + std::to_string( sizeof( off64_t ) ) + ", signed " + std::to_string( std::is_signed_v<off64_t>) );
REQUIRE( 8 == sizeof(off64_t) );
}
}
TEST_CASE( "Standard C Library 01.01", "[libc]" ) {
print_libc();
}
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